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| Home > Publications database > Radiochemical studies related to the development of new production routes of some diagnostic and therapeutic radionuclides |
| Dissertation / PhD Thesis/Book | PreJuSER-10899 |
2007
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/3123
Report No.: Juel-4271
Abstract: Nuclear reaction cross section measurements were done in connection with the development of new production routes of the therapeutic and diagnostic radionuclides $^{32}P, ^{71}As, ^{72}As, ^{73}As, ^{74}As, ^{82}Sr, ^{90}Y, ^{153}Sm and ^{169}$Yb. Investigations on the production of n.c.a. $^{73}$Se using novel targetry were also performed. Integral cross sections were measured for the $^{nat}$S(n,p)$^{32}$P, $^{nat}$Zr(n,p)$^{90}$Y and $^{nat}$Eu(n,p)$^{153}$Sm reactions using a 14 MeV d(Be) neutron field. The neutron spectrum was characterised using multiple foil activation and the code SULSA. Existing cross section data were validated within 10 - 15 %, thereby substantiating earlier evaluated and recommended excitation functions of the investigated reactions. It is inferred that for production of radionuclides via the (n,p) reaction, a fast neutron spectral source (e.g. spallation or fusion) would be better suited than a fission reactor. Proton and a-particle induced reactions were investigated in the high-mass area for the production of $^{153}$Sm and $^{169}$Yb via alternative routes. Measurements were done for the first time on the $^{nat}$Nd($\alpha$,n)$^{153}$Sm process over the energy range of 10 to 26.5 MeV and the possible production yield of $^{153}$Sm amounts to 2 GBq. The excitation function of the $^{169}$Tm(p,n)$^{169}$Yb reaction was determined over the energy range from threshold to 45 MeV and compared with the results of nuclear model calculation based on the ALICE-IPPE code. A good agreement was found. The calculated possible production yields are lower than those via the conventional (n,$\gamma$) production route, but the produced $^{153}$Sm and $^{169}$Yb are in no-carrier-added form. Cross sections were also measured with regard to the production of $^{71}As, ^{72}As, ^{73}As and ^{74}$As via the $^{nat}$Ge(p,xn) processes and the results were compared with those from the ALICE-IPPE calculations. Possible yields were calculated together with potential impurities. The various processes contributing to the formation of $^{71}$As in the irradiation of $^{nat}$Ge were analysed by performing some additional measurements on enriched $^{72}$Ge. For the standardisation and validation of data for the production of $^{82}$Sr via the $^{nat}$Rb(p,xn) process, cross section measurements on the formation of the long-lived impurity $^{85}$Sr were done over the energy range of 25 to 45 MeV, a range where a gap still existed. Integral yields were calculated, allowing for an evaluation of the best production conditions of $^{82}$Sr. Preliminary studies on the production of n.c.a. $^{73}$Se via the $^{75}$As(p,xn) reaction using AIAs as a novel target material were also carried out. Thick target yields were determined and first tests on the radiochemical separation of n.c.a. radioselenium from the target were performed.
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